pyriform

1835, Richard Owen, Descriptive and Illustrated Catalogue of the Physiological Series of Comparative Anatomy Contained in the Museum of the Royal College of Surgeons in London, Volume 3, Part I: Nervous System and Organs of Sense, page 25,

The chief difference between this brain and that of the Turtle obtains in the large size of the optic lobe and cerebrum as compared with the cerebellum, in the more pyriform figure of the cerebral hemispheres, and in the transverse fissure of the cerebellum.

In fact, Clavigula is very similar to Glochidorella, differing from this mainly in the absence of perioral disc (vs. presence), shape of pharyngeal bulb (more cylindrical vs. more pyriform) and more robust spicules.